Navigate to the Form you want to create a new instance for. You can create this by clicking on the "+New" button and filling in the form that opens up. The form opens and is available to view for use by others.
In this example, you can create a new instance under the VO Registry form by clicking on the "+New VO" button.
If you were filling in a Site Monitoring Form instance, you would see the below form, which you can fill in and Save.